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authorXie Yongji <xieyongji@bytedance.com>2022-08-03 07:55:20 +0300
committerMichael S. Tsirkin <mst@redhat.com>2022-08-11 11:26:08 +0300
commit82eb46f94ae5faa87ace248d950292c87384a097 (patch)
tree59bc34926c52e9c16aba821a508226adf9715c7f /drivers
parentc32ee693125aa19a021dad32abbd49f5c6f70031 (diff)
downloadlinux-82eb46f94ae5faa87ace248d950292c87384a097.tar.xz
vduse: Use memcpy_{to,from}_page() in do_bounce()
kmap_atomic() is being deprecated in favor of kmap_local_page(). The use of kmap_atomic() in do_bounce() is all thread local therefore kmap_local_page() is a sufficient replacement. Convert to kmap_local_page() but, instead of open coding it, use the helpers memcpy_to_page() and memcpy_from_page(). Signed-off-by: Xie Yongji <xieyongji@bytedance.com> Acked-by: Jason Wang <jasowang@redhat.com> Reviewed-by: Muchun Song <songmuchun@bytedance.com> Message-Id: <20220803045523.23851-3-xieyongji@bytedance.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/vdpa/vdpa_user/iova_domain.c9
1 files changed, 4 insertions, 5 deletions
diff --git a/drivers/vdpa/vdpa_user/iova_domain.c b/drivers/vdpa/vdpa_user/iova_domain.c
index bca1f0b8850c..50d7c08d5450 100644
--- a/drivers/vdpa/vdpa_user/iova_domain.c
+++ b/drivers/vdpa/vdpa_user/iova_domain.c
@@ -138,18 +138,17 @@ static void do_bounce(phys_addr_t orig, void *addr, size_t size,
{
unsigned long pfn = PFN_DOWN(orig);
unsigned int offset = offset_in_page(orig);
- char *buffer;
+ struct page *page;
unsigned int sz = 0;
while (size) {
sz = min_t(size_t, PAGE_SIZE - offset, size);
- buffer = kmap_atomic(pfn_to_page(pfn));
+ page = pfn_to_page(pfn);
if (dir == DMA_TO_DEVICE)
- memcpy(addr, buffer + offset, sz);
+ memcpy_from_page(addr, page, offset, sz);
else
- memcpy(buffer + offset, addr, sz);
- kunmap_atomic(buffer);
+ memcpy_to_page(page, offset, addr, sz);
size -= sz;
pfn++;